Update .sr-only mixin and utility (#25197)

* Remove clip-path from .sr-only utility as it causes perf regressions in Chrome * change snippet to example
twbs · Feb 11, 2018 · 9811121 · 9811121
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diff --git a/docs/4.0/utilities/screenreaders.md b/docs/4.0/utilities/screenreaders.md
@@ -12,9 +12,9 @@ Hide an element to all devices **except screen readers** with `.sr-only`. Combin
 Necessary for following [accessibility best practices]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/#accessibility).
 {%- endcomment -%}
 
-{% highlight html %}
+{% example html %}
 <a class="sr-only sr-only-focusable" href="#content">Skip to main content</a>
-{% endhighlight %}
+{% endexample %}
 
 {% highlight scss %}
 // Usage as a mixin

diff --git a/scss/mixins/_screen-reader.scss b/scss/mixins/_screen-reader.scss
@@ -11,7 +11,6 @@
   overflow: hidden;
   clip: rect(0, 0, 0, 0);
   white-space: nowrap;
-  clip-path: inset(50%);
   border: 0;
 }
 
@@ -30,6 +29,5 @@
     overflow: visible;
     clip: auto;
     white-space: normal;
-    clip-path: none;
   }
 }